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Diffstat (limited to 'examples/redis-unstable/src/lolwut.c')
| -rw-r--r-- | examples/redis-unstable/src/lolwut.c | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/examples/redis-unstable/src/lolwut.c b/examples/redis-unstable/src/lolwut.c deleted file mode 100644 index 8467c78..0000000 --- a/examples/redis-unstable/src/lolwut.c +++ /dev/null @@ -1,172 +0,0 @@ -/* - * Copyright (c) 2018-Present, Redis Ltd. - * All rights reserved. - * - * Licensed under your choice of (a) the Redis Source Available License 2.0 - * (RSALv2); or (b) the Server Side Public License v1 (SSPLv1); or (c) the - * GNU Affero General Public License v3 (AGPLv3). - * - * ---------------------------------------------------------------------------- - * - * This file implements the LOLWUT command. The command should do something - * fun and interesting, and should be replaced by a new implementation at - * each new version of Redis. - */ - -#include "server.h" -#include "lolwut.h" -#include <math.h> - -void lolwut5Command(client *c); -void lolwut6Command(client *c); -void lolwut8Command(client *c); - -/* The default target for LOLWUT if no matching version was found. - * This is what unstable versions of Redis will display. */ -void lolwutUnstableCommand(client *c) { - sds rendered = sdsnew("Redis ver. "); - rendered = sdscat(rendered,REDIS_VERSION); - rendered = sdscatlen(rendered,"\n",1); - addReplyVerbatim(c,rendered,sdslen(rendered),"txt"); - sdsfree(rendered); -} - -/* LOLWUT [VERSION <version>] [... version specific arguments ...] */ -void lolwutCommand(client *c) { - char *v = REDIS_VERSION; - char verstr[64]; - - if (c->argc >= 3 && !strcasecmp(c->argv[1]->ptr,"version")) { - long ver; - if (getLongFromObjectOrReply(c,c->argv[2],&ver,NULL) != C_OK) return; - snprintf(verstr,sizeof(verstr),"%u.0.0",(unsigned int)ver); - v = verstr; - - /* Adjust argv/argc to filter the "VERSION ..." option, since the - * specific LOLWUT version implementations don't know about it - * and expect their arguments. */ - c->argv += 2; - c->argc -= 2; - } - - if ((v[0] == '5' && v[1] == '.' && v[2] != '9') || - (v[0] == '4' && v[1] == '.' && v[2] == '9')) - lolwut5Command(c); - else if ((v[0] == '6' && v[1] == '.' && v[2] != '9') || - (v[0] == '5' && v[1] == '.' && v[2] == '9')) - lolwut6Command(c); - else if ((v[0] == '8' && v[1] == '.' && v[2] != '9') || - (v[0] == '7' && v[1] == '.' && v[2] == '9')) - lolwut8Command(c); - else - lolwutUnstableCommand(c); - - /* Fix back argc/argv in case of VERSION argument. */ - if (v == verstr) { - c->argv -= 2; - c->argc += 2; - } -} - -/* ========================== LOLWUT Canvas =============================== - * Many LOLWUT versions will likely print some computer art to the screen. - * This is the case with LOLWUT 5 and LOLWUT 6, so here there is a generic - * canvas implementation that can be reused. */ - -/* Allocate and return a new canvas of the specified size. */ -lwCanvas *lwCreateCanvas(int width, int height, int bgcolor) { - lwCanvas *canvas = zmalloc(sizeof(*canvas)); - canvas->width = width; - canvas->height = height; - canvas->pixels = zmalloc((size_t)width*height); - memset(canvas->pixels,bgcolor,(size_t)width*height); - return canvas; -} - -/* Free the canvas created by lwCreateCanvas(). */ -void lwFreeCanvas(lwCanvas *canvas) { - zfree(canvas->pixels); - zfree(canvas); -} - -/* Set a pixel to the specified color. Color is 0 or 1, where zero means no - * dot will be displayed, and 1 means dot will be displayed. - * Coordinates are arranged so that left-top corner is 0,0. You can write - * out of the size of the canvas without issues. */ -void lwDrawPixel(lwCanvas *canvas, int x, int y, int color) { - if (x < 0 || x >= canvas->width || - y < 0 || y >= canvas->height) return; - canvas->pixels[x+y*canvas->width] = color; -} - -/* Return the value of the specified pixel on the canvas. */ -int lwGetPixel(lwCanvas *canvas, int x, int y) { - if (x < 0 || x >= canvas->width || - y < 0 || y >= canvas->height) return 0; - return canvas->pixels[x+y*canvas->width]; -} - -/* Draw a line from x1,y1 to x2,y2 using the Bresenham algorithm. */ -void lwDrawLine(lwCanvas *canvas, int x1, int y1, int x2, int y2, int color) { - int dx = abs(x2-x1); - int dy = abs(y2-y1); - int sx = (x1 < x2) ? 1 : -1; - int sy = (y1 < y2) ? 1 : -1; - int err = dx-dy, e2; - - while(1) { - lwDrawPixel(canvas,x1,y1,color); - if (x1 == x2 && y1 == y2) break; - e2 = err*2; - if (e2 > -dy) { - err -= dy; - x1 += sx; - } - if (e2 < dx) { - err += dx; - y1 += sy; - } - } -} - -/* Draw a square centered at the specified x,y coordinates, with the specified - * rotation angle and size. In order to write a rotated square, we use the - * trivial fact that the parametric equation: - * - * x = sin(k) - * y = cos(k) - * - * Describes a circle for values going from 0 to 2*PI. So basically if we start - * at 45 degrees, that is k = PI/4, with the first point, and then we find - * the other three points incrementing K by PI/2 (90 degrees), we'll have the - * points of the square. In order to rotate the square, we just start with - * k = PI/4 + rotation_angle, and we are done. - * - * Of course the vanilla equations above will describe the square inside a - * circle of radius 1, so in order to draw larger squares we'll have to - * multiply the obtained coordinates, and then translate them. However this - * is much simpler than implementing the abstract concept of 2D shape and then - * performing the rotation/translation transformation, so for LOLWUT it's - * a good approach. */ -void lwDrawSquare(lwCanvas *canvas, int x, int y, float size, float angle, int color) { - int px[4], py[4]; - - /* Adjust the desired size according to the fact that the square inscribed - * into a circle of radius 1 has the side of length SQRT(2). This way - * size becomes a simple multiplication factor we can use with our - * coordinates to magnify them. */ - size /= 1.4142135623; - size = round(size); - - /* Compute the four points. */ - float k = M_PI/4 + angle; - for (int j = 0; j < 4; j++) { - px[j] = round(sin(k) * size + x); - py[j] = round(cos(k) * size + y); - k += M_PI/2; - } - - /* Draw the square. */ - for (int j = 0; j < 4; j++) - lwDrawLine(canvas,px[j],py[j],px[(j+1)%4],py[(j+1)%4],color); -} |